Math Problem Statement

Lös ekvationssystemet med substitutionsmetoden. x - 5y = -3, 4x - 3y = 5

Solution

The problem involves solving a system of linear equations using the substitution method. The system provided is:

  1. x5y=3x - 5y = -3
  2. 4x3y=54x - 3y = 5

Step-by-Step Solution:

Step 1: Solve one equation for one variable

From equation (1):
x5y=3x - 5y = -3
Solve for xx:
x=5y3x = 5y - 3

Step 2: Substitute xx into the second equation

Substitute x=5y3x = 5y - 3 into equation (2):
4x3y=54x - 3y = 5
4(5y3)3y=54(5y - 3) - 3y = 5
Expand:
20y123y=520y - 12 - 3y = 5
Combine like terms:
17y12=517y - 12 = 5
Solve for yy:
17y=1717y = 17
y=1y = 1

Step 3: Solve for xx using y=1y = 1

Substitute y=1y = 1 into x=5y3x = 5y - 3:
x=5(1)3x = 5(1) - 3
x=53x = 5 - 3
x=2x = 2

Final Answer:

x=2,y=1x = 2, \, y = 1


Would you like a detailed explanation of the steps or additional examples?

Related Questions:

  1. Can the substitution method be used for nonlinear systems?
  2. How does the elimination method compare to substitution for solving systems?
  3. What are real-world applications of solving systems of equations?
  4. How can graphing validate the solution to this system?
  5. What is the determinant of a system matrix, and how does it relate to solutions?

Tip:

Always check your solution by substituting xx and yy back into both original equations to ensure they satisfy the system.

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Math Problem Analysis

Mathematical Concepts

Linear equations
Systems of equations
Substitution method

Formulas

Isolate one variable: x = expression or y = expression
Substitute into the other equation

Theorems

Properties of equality

Suitable Grade Level

Grades 8-10